155840093 has 2 divisors, whose sum is σ = 155840094. Its totient is φ = 155840092.

The previous prime is 155840077. The next prime is 155840099. The reversal of 155840093 is 390048551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153091129 + 2748964 = 12373^2 + 1658^2 .

It is a cyclic number.

It is not a de Polignac number, because 155840093 - 2⁴ = 155840077 is a prime.

It is a super-2 number, since 2×155840093² = 48572269172497298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155840099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77920046 + 77920047.

It is an arithmetic number, because the mean of its divisors is an integer number (77920047).

Almost surely, 2^155840093 is an apocalyptic number.

It is an amenable number.

155840093 is a deficient number, since it is larger than the sum of its proper divisors (1).

155840093 is an equidigital number, since it uses as much as digits as its factorization.

155840093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 155840093 is about 12483.5929523515. The cubic root of 155840093 is about 538.1372638432.

The spelling of 155840093 in words is "one hundred fifty-five million, eight hundred forty thousand, ninety-three".